I don't think there's really any tried and true method. Everyone is just trying their best. I would say be kind. It takes effort, but it's doable. And don't let people take advantage of you but don't be mean either. A lot of maturity comes from experience too because you've already been through situations so you know how to react instead of being o...... reply
1) it is helpful to get professional help, they are quite an investment but I think that it's the most efficient one
2) try to be uncomfortable once a day (like doing something you don't want to do)
3) jokes on you maturity is subjective and hard to define plus you have many goals and they are too precise so even if you plan to change by your de...... reply
